Safety brake device



Aug. 26, 1930. 5, DOWN 1,774,174

swan BRAKE nzvxcs Filed May 5, 192a INVENTOR SIDNEY Ca. DOWN ATTORNEY Patented Aug. 26:, 1930 i SIDNEY e. nown onnnenwoon, PE NSYL ANIA; nssienon re 'rnn wns'rinenopsn' AIR Baniznoorirnn or witnnnnrne, rnnnsvavnnm, oonronn'rion or rnnnsv vnme Application filed E ES? This invention relates to fluid pressure train;

' Another important object of my invention is to provide means for operating the brakes V the'usual angle cocks "6. A V I .The brake valve device 1 is connected" by a" pipe 7 withthe main reservoir 8 and; bya branchpipe Q with'the brake pipe '2 ilh e I i valve chamber 39 hasicommunication withougfh abranchi pipe 41.

through thesignal pipe in case an angle cock should be closed for any reason, a I

' A further object of ;my mventionris the provision of a vent valvelocatedon each car of the train having communication with the signal pipe and bralze pipeywith means 10- cated on the locomotiveand cooperating with the engineers brake valve for charging the signal pipe from the-inain reservoir,when;

the brake valve is moved-toan emergency position, the fluid under pressure in thesignal pipe acting upon the vent valves to permit the same to vent thebrake pipe and consequently bring about a brake application even though an angle cock at any point in the train'should be closed.-

Other objects of the invention will'appear as thedescription proceeds In the:drawing, -thesingle figure is a diagrammatic view illustrating the application ofmy invention toia fluid" pressure brake ystem. r-

' The fluid pressure brake system may 'in-- cludethe usual engineers brake valve l lo l cated onthe locomotive and'brakeand signal I i pipesQ and 3.' The sections of the brake and; signal pipes 2 and 3- carriedby 'the'ilocomotive and cars can'be connected by'the usual flexible hose and couplings land 5, thebrake pipe at the couplings being the same will not be described :in' detail, but it can: be seen that-.when'therotary valve 11 thereof is turned to emergency position, as

shown fin the drawing, the "bralrepipe 2 ve t d to the a m ph re by m ns o pipe :9,

'17, chamber 18 and port'19 in the rotary 'valver each car of the train. 7 The relayvalvedevice ,i ribgklwhen' the piston; is inits lowered posit on, 'for' outting ofl" communicatlon between 1 provided 'with I the signal pipe "3- tb 4L3; However, when the pressure in chamber passages 12 and 13, ca vity l4,in1valve l1, and I atmospheric port 15 i In this; position, the '1 sand pipe l0 is connected with the mainres- "f ervoir 8, by means ofpi'pe 7 passages 16 and In accordance with this invention, I may provide, a-relay valv'e' device 20,1ocated' on the locomotive and a vent'valve 21 carried by may consistof a body 22 having spacedchambers'23 a'ndQl; and'a' piston chamber 25. A piston26'is mounted in the chamber '25 and is adapted to. operate double beat j valves 27 andQS, whichare adapted to fit uponseats 29 and 30, respectively. The valve 27 isadapted to control the flow of fluid on? der'pre'ssu'rerfrom chamber 23 to the lower face ofithe piston26, while the valve 28 is:

adapted to control the flow of fluid under pressure from chamberiQeto chamber 23; "A spring 31 is employed-for normally holding thevalve-28 on its seat'30, anclthe valve 27 connected with the valve 27 and a spring 32 normally functions to hold the valve in a joff-of its seat 29. The piston 26 is sli'dably 1 i of the piston and isadapted to fit upon a seat i the pistonchamber and the chamber 23; Abranch pipe 35is employed for connect j ing the sand pipelO-with the piston cham- Y ber, whlle'a branch pipe 36 connects .theinain' reservoir pipe 7" with the-chamber 2 L. -i A f Refer'ringoto the vent valve 21,1the

chamberf39 to a piston chamber ifl'and'this 3 9 "rises above normalsignal pipe pressure,

inst

this fluid under pressure acting on the diaphragm 42 will raise the valve 38 oil of its seat against the tension of coil spring 43. A' piston 44 slidably mounted in tlje chamber 40 is employed for operating a valve 45, which controls communication between chambers 46 and 47. The chamber 46 is provided with a vent port 48 and the chamber 47 is connected I with the brake pipe 2, by a branch pipe 49. The valve 45 is normally heldon its seat for preventing communication between the chainbers 46 and 47 by a coil spring 50.

In operation of the device, upon brake failure, caused by a closed angle cock 6 at any point in the train, the rotary valve 11 of the engineers brake valve 1 is moved to emergency position, as shown, which will allowfluid under pressure 'from main reservoir Sto flow to sand pipe 10 through pipe '5, passage 16, chamber 18, port 19 and passage 17.

This flow of fluid under pressure will enter piston chamber 25, of the relay valve device 20, through pipe 35, which will cause downthe'venting of the brake pipe 2 to the atmos- 1 ward'movement of the piston 26 and operation of the double beat valves 27 and 28, the valve 27 moving to a seated position and the valve 28 to an unseated position. The unseating of the valve 28 establishes communi cation between chambers 23 and 24, which willallow flow of fluid under pressure from the main reservoir 8 tosignal pipe 3, through phere, through the vent port 48, due to the connection of the brake pipe 2 by pipe 49 with the chamber 47. The venting of the brake pipe 2 will cause the application of the brakesin the usual way.

7 When the engineers brake valve 1 is moved back to running position, communication is cut off betweenthe main reservoir 8 and the sand pipe and the parts of the apparatus will consequently return to their normal position. 7 While one illustrative embodiment of the invention has beendescribed in detail, it is not my, intention tolimit itsscope to that embodiment orv otherwise than by the terms.

of the appended. claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is I 1 i -1, In a fluid pressure brake, the combination with ,abrake pipe, a signal pipe anda main reservoir, of a relay valve located on the locomotive and operated. upon an increase in fluid pressure for supplying fluid under pressure from the main reservoir to the signal pipe, an engineers brake valve adapted in one position to supply fluid under pressure to said relay valve for establishing communica tion bet-ween the main reservoir and signal pipe, and a vent valve adapted to be located on each car of a train connected with the signal pipe and operable when subjected to main reservoir pressure for venting said brake pipe.

2. In a fluid pressure brake, the combination with a brake pipe, a signal pipe and a main reservoir, of a relay valve device located on the locomotive of a train connected with the main reservoir and signal pipe including a valve for controlling the flow of fluid under pressure from the main reservoir to the signal pipe, and means operated by fluid under pres sure for opening the valve, an engineers brake valve adapted in one position to supply fluid under pressure to said means, and a vent valve adapted to be located on each car of a train connectedwith the signal pipe'and operable when subjected to main reservoir pressure for venting said brake pipe 3. In a fluid pressure brake, the combination with a brake pipe, a signal pipe and a main reservoir, of a relay valve device located on the locomotive of a train connected ,3

with the main reservoir and signal pipe including a valve for controlling the flow of fluid under pressure from the main reservoir tothe'signal pipe, and means, when subjected to fluid under pressure, for operating the valve, an engineers brake valve connected with the main reservoir, a sand pipe connected with the engineers brake valve and said valve operating means of the relay valve device, the engineers brake valve adapted in one position to establish communication between the main reservoir and sand pipe, and means located on each car of a train connected with thesignal pipe for venting said brake pipe 7 when subjected to main reservoir pressure '4. In a fluid pressure brake, the combination with a brake pipe, asignal pipe, and a main reservoir, of an engineers brake valve adapted in one position to supply fluid under pressure from the main reservoir to the signal pipe, and a vent valve device located on each car of atrain including a vent chamber and a valve chamber, a valve in the valve chamber for controlling communication between the chambers, means connecting the brake pipe with the valve chamber, and means subject to pressure in the signal pipe for unseating said valve.

5. In a fluid pressure brake, the combination with a brake pipe, a signal pipe, and a main reservoir, of an engineers brake valve adapted in one position to supply fluid under pressure from the main reservoir to the signal pipe, and a vent valve device located on each car of a train including a vent chamber and a valve chamber, a valve in'the valve chamber for controlling communication between the chambers, means connecting the brake pipe with the valve chamber, means subject to I 1 pressure for unseating the valve, a valve for f controlling flow of fluid undervpressure to.

said valve operating means, adiaphragm connected with said last mentioned valve, and

means for subjecting the diaphragm-to fluid under pressure from said signal pipe.

6. In a fluid pressure brake, thecombina tion with a brake pipe, a' signal pipe and a main reservoir, of a relay valve device located on the locomotive'of a train connected with y the main reservoir and signal plpe mcludmg a valve for controlling the flow of fluid under pressure from the mam reservoir tothe slgnal pipe, and means, whensubjectedto fluid under pressure, for operating the valve, "an engineers brake valve connected with the main V 1 reservoir, a sand pipe connected with, the engineers brake valve and said valve operating means of the relay valve device, the engineers brake valve adapted in one position to establish communication between the main reservoir and sand pipe, and a vent valve device located on each car ofa train including a' vent chamber and a valve chamber, a valve in the valve chamber controlling communica tion between the chambers, means connecting the brake pipe with the valve chamber, means subject to pressure .for unseating the valve,

a valve for controlling the flow'of fluid under pressure to said valve operating means, a

.. diaphragm connected with said last mentioned valve, and means for subjecting the r diaphragm to fluid under pressure from said signal plpe.

In testnnony whereof I 'have 'hereunto set we SllDNE Y G. Downy] my hand. 

